1. The document describes a prototype for an electric vehicle charging station that uses RFID technology for user identification and authorization. 2. The charging station system uses an RF transmitter and receiver module along with a microcontroller to control relays and charge the vehicle battery for different lengths of time depending on which button the user presses. 3. The system is designed to be low-cost and provides contactless charging authorization through RFID to simplify the charging process for electric vehicle users.

1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3736
Charging Station for Electric Vehicles Using RF Module
Darshitkumar Gohel1, Yash Shah2, Prakruti Shah3
1-2UG Scholar, Department of Electrical Engineering, Navrachana University, Vadodara, Gujarat, India.
3Assistant Professor, Department of Electrical Engineering, Navrachana University, Vadodara, Gujarat, India.
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Abstract - The requirement for clean environment has
promoted the development of green car technology such
as electric vehicles which are cost effective too. The
number of Electric Vehicles (EVs) on the roads are
increasing so charging infrastructure is gaining an
important role. There are several issues on the EV
charging system and some of them are option for
improving the operation and efficiency, understanding of
the charging behaviours of existing EV users. Thus, in
this paper, we have introduced RFID (radio frequency
identification) technology which allows automatic
identification of users. This technology uses
electromagnetic waves to transmit and receive
information of the users.
Key Words: RFID, Electric Vehicle, Micro Controller,
Charging Station
1. INTRODUCTION
The Internet of Things, also called things-linked
internet, it refers to a kind of network that adopts RFID
(radio frequency identification), infrared sensor, and
other sensing devices, to enable the linkage between
any articles and the internet, to enable the exchange and
communication of information, This paper aims to
discuss the application of RFID technology in the
battery charging stations, and analyse the technical
advantages of RFID technology in the electric vehicle
identification as well as the unified management of the
battery charging compartment. These advantages
enable RFID technology to provide better service for the
electric vehicle industry, and support the effective
management of the battery charging compartment. At
present many regions have started forming charging
station for electric vehicles but still have not completed
a sophisticated layout planning system.
1.1 LITERATURE REVIEW
With the development of EVs, many studies have begun
for layout and technology of public charging stations.
C. Panatarani et al. (2016) developed a charging station
using microcontroller ATMEGA8535 and RFID as
controller and identifier of the EV users, respectively. It
has desired features for electric vehicle from renewable
energy resources grid connected with solar panel. Halil
et al. (2018) developed a wireless charging station for
electric vehicle controlled by RFID tag. The charging
was very easy because the power transfer method is
wireless. N.KALYANI et al. (2014) have developed RFID
based secured access system using 8051
microcontroller and is very commonly used in offices,
institutes, homes, etc. by referring this paper we have
understand the interfacing of RFID with 8051. Ching-
Yen Chung et al. (2013) have proposed a mesh network
RFID system for user identification and charging
authorization for smart charging grid connection. It
provides a cost-efficient solution to identify and
authorize vehicles. WentaoJing et al. (2017)
investigated the effect of the location of BEVs public
charging facilities on a network with mixed
conventional gasoline vehicles (GVs) and BEVs.
2. RF MODULE TECHNOLOGY
In generally, the wireless systems having two
constraints: it must operate over a certain distance with
a certain amount of information within a data rate which
is transfer speed of RF module. The RF modules are very
small in size and having a wide operating range of
voltage. i.e. 3V to 12V.
Simply the RF modules are 433 MHz RF transmitter and
receiver modules. The transmitter draws no power when
transmitting logic zero it suppressing fully the carrier
frequency so it consumes significantly low power in
operation which is desirable. Instead of logic zero if logic
one is sent, carrier is fully on to about 4.5mA with a
3volts power supply. The data is being sent serially from
the Rf transmitter which is received by the tuned
receiver. Transmitter and the receiver are interfaced to
two microcontrollers for data transfer.

2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3737
3. PROTOTYPE OF CHARGING STATION FOR
ELECTRIC VEHICLE
Here In this we research paper we have proposed a
prototype model which is cost effective and consists of
RF module, 8051 micro-controller, Relays, etc. this is
basic model for charging station for electric vehicle and
If we want to implement this for large scale then we need
to further add some features.
The description as well as working of this project is
discussed in this section.
3.1 BLOCK DIAGRAM
The working model of charging station for electric
vehicle contains transmitter with encoder, receiver with
decoder, micro-controller, power supply circuit, set of
relays. Here Users who wants to charge their vehicle
carries the transmitter and, in the transmitter, there are
different push buttons. According to for how long the
battery needs to be charged the users will operate the
transmitter. This transmitter contains encoder which
encode the data and this data will be transmitted by
transmitting antenna.
Now, at charging station side there will be a receiver.
The receiving antenna receives the data transmitted by
transmitting antenna. This receiving antenna is
connected to the decoder so this data goes to the
decoder. After decoding of data it’s further given to the
micro-controller.
This both transmitter and receiver work on radio
frequency(433Mhz).
The 8051 micro-controller controls the relay switching
accordingly. For example, push button 2 was operated by
user and after that this data transmitted and received by
RF module. Here we have programmed micro controller
in a such way that for different push buttons the relay
will make connections charger to the electric vehicle for
different amount of time and after that relay will break
the connection.
3.2 WORKING OF PROTOTYPE
I. TRANSMITTER
SCHEMATIC DIAGRAM:

3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3738
ACTUAL HARDWARE MODEL:
In transmitter circuit we have used HT12E to encode the
data for easy transmission. Here we have grounded all
the 8 address pins for coupling it with HT12D. At 4 data
pins we have 4 push buttons with a led indication. So,
when we operate any push button at data pins this will
simply convert into serial data and this can be easily
transmitted by RF transmitter. All the resistors are used
for limiting the excessive currents.
II. RECEIVER
SCHEMATIC DIAGRAM:
ACTUAL HARDWARE MODEL:
In receiver circuit we have used HT12D to decode the
received encoded data. Here we have all the 8 address
pins for coupling it with HT12E. We have given this
output pins to the micro-controller through Not gate
because the output from HT12D will be low (0). Data
received from is given to 14th pin. This receiver will
encode the data which can be given to micro-controller.
III. MICRO CONTROLLER
Here in this circuit we have connected Port-1 with
output pins from receiver circuit, Port-2 is connected
with relay circuit, Port-3 is connected with LCD (16*2),
other connections are common for 8051 micro-
controller.
Now If user has operated push button 1, then it will be
transmitted by encoder and RF transmitter, then at the
charging station side RF receiver receives the signal after
decoding using decoder this signal goes to micro-
controller through NOT gate. That will lead to pin 1.0
high. According to program if P1.0 goes high then relay
connected P2.0 will make connection the charger with
connected battery with relay-1 for 60 seconds i.e. 1
minute, as well as LED and Buzzer connected to P2.5 will
be on.
Accordingly, if user operate push button 2,3 and 4 then
Relay-2 will start for 120 seconds (2 minutes), Relay-3
will start for 180 seconds (3 minutes) and Relay-4 will

4. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3739
start for 300 seconds (5 minutes) respectively. Output
from micro-controller is given to the relay by amplifying
using LN2003 Darlington’s transistor pair so that it can
drive the relay.
SCHEMATIC DIAGRAM:
ACTUAL HARDWARE MODEL:
IV. AUTO CUT-OFF
SCHEMATIC DIAGRAM:
ACTUAL PHOTO:
This circuit needs to be connected between your existing
charger and battery. Normally the relay is off and the
charging is On but when battery voltage increases to the
selected voltage the relay energized by the transistor
which now disconnect the battery from charger and LED
will glow.
4. CONCLUSION
Here we have designed a simple charging station for
electric vehicle using microcontroller, relays and RF
module that can enable charging for user’s vehicle. This
RFID charging station authorization system provides a
convenient method for a user to enable charging at
charging station. The proposed system represents an
improvement over the existing system as it allows
charging authorization to take place seamlessly at the
moment of EV arrival and does not require any other
people to involvement. This method will save the
operation time by introducing RFID system at charging

5. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3740
station as automatic authorization of user can be
involved in this system. RF transmitter and Receiver will
give a huge operation range to this system.
FUTURE SCOPE:
a) Here we can use the turbo charger or fast charger for
efficient and fast operation, this will save the time
required to charging operation.
b) We can connect this charging station system with
computer network so we can enable computerized
billing instead of manual billing and store data of user for
how much time they have used this charging service.
ACKNOWLEDGEMENT
Reasons can be given and they can be many but nothing
can replace the efforts of numerous people behind the
work, put in by the creator, giving us constant support all
the way. We express our heartily gratitude to Prof.
Prakruti Shah, Electrical Engineering. Her invaluable
guidance, advice & time from her extremely busy
schedule made this work an enthusiastic experience. We
wish to express our most sincere gratitude for her
whole-hearted cooperation.
REFERENCES
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